KOMATSU GPM 200F2-3 CNC crankshaft machining center

The KOMATSU GPM 200F2-3 CNC crankshaft machining center was manufactured in 2002 in Japan. The machine is used to process crankshafts with a maximum length of 700 m. The cross slide moves longitudinally on the bed guides by means of an AC (alternating current) actuator. The handle is mounted on the working head which is permanently screwed to the bed. The chuck has a centering triple jaw in a cast steel housing, which acts with a clamping force of 80 kN. The machine tool works in six axes (X1, X2, Y1, Y2, Z1, Z2) with maximum feeds of +/- 172.5 mm (for X1 and X2 axes), +/- 95 mm (for Y1 and Y2 axes) and +/- 450 mm (for Z1 and Z2 axes). The axes have a SIEMENS 1FT6 actuator with an brake Absolute and are computer controlled by a SIEMENS Sinumerik 840D CNC controller. Rapid feeds in the X, Y, Z axes are respectively 12040 mm/min, 6700 mm/min and 14400 mm/min. The machine spindles rotate at 188 rpm. The machine tool also has a workpiece support that prevents vibrations and enables stable machining during machining. The GPM 200F2-3 machining center weighs 26,000 kg.

Technical data of the KOMATSU GPM 200F2-3 machine for crankshafts

– CNC control: SIEMENS Sinumerik 840D
– number of controlled axes: 6
– maximum detail length: 700 mm
– minimum eccentric diameter: 210 mm
– minimum diameter of the main journal: ƒ50 mm
– height of the chuck center: 1280 mm
– maximum feed in axes:
X1: +/- 172.5 mm (tool center 95 mm)
X2: +/- 172.5 mm (tool center 95 mm)
Y1: +/- 95 mm
Y2: +/- 95 mm
Z1: +/- 450 mm
Z2: +/- 450 mm
– maximum rapid feed in the axes:
X: 12040 mm/min
Y: 6700 mm/min
Z: 14400 mm/min
– X, Y, Z axis actuator: SIEMENS 1FT6 with an brake Absolute
– number of spindles: 2
– spindle motor power: 37 kw
– spindle speed: 188 rpm
– cutting speed 142 m/min
– tool diameter: 240 mm
– workpiece steady
– workpiece head (2 pcs.)
– hydraulic unit tank capacity: 100 l
– voltage: alternating current, 3-phase, 380V +/- 10%, 50Hz +/- 1Hz
– machine height: 2950 mm
– total weight of the GPM 200F2-3 machine: 26 t

Process of machining a workpiece in KOMATSU GPM 200F2-3

1. The workpiece is loaded,
2. The chucks are clamped,
3. Z1 and Z2 axes are moving,
4. Tools are moving on the surface (axes X1, X2 and Y1, Y2),
5. Release of the support,
6. Axes Z1 Z2 move to rest position,
7. Release of the chuck,
8. Unloading of workpiece.